<?xml version="1.0" encoding="utf-8"?>
<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui">
  <ribbon>
    <tabs>
      <tab id="Sync" label="Sync">
        <group id="ContactsSyncGroup" label="Sync">
          <button id="NewCustomButton"                          
                  imageMso="DelegateAccess"                          
                  size="large"                          
                  label="Contacts"                          
                  onAction="ButtonClicked"/>
        </group>
      </tab>
    </tabs>
  </ribbon>
</customUI>